You just answered your question of "is it just luck" by your self...Football professionals know much more about the works of football than we do. There must be something Willian and the coaches worked on the training ground in the summer that is making all these goals. Even more positive of that since he uses the same technique as well. Also, with delivering all these great free kicks his confidence in his ability must be sky high! That, along with the other reasons, must be why he is doing it so well. Like his goal with Dynamo. When I saw that we won a free kick at that spot and saw Willian step up I knew it was going to be a goal. Reminds me of how it was when Mata was doing our attacking set pieces (corners, free kicks).